VTG Ralph Lauren Polo Jeans Company Jeans american flag Mens 30x33 big 20"

i have no idea what the big 20" means inside the tag if anyone could enlighten me i would appreciate. The original tagged size should always be presumed to be incorrect for all pre-worn clothing, it is only provided for reference. You can save a small fortune on buying good pre-worn clothes but you have to know your measurements. jeans measured flat side to side at waist 15" or about 30 around leg open at crotch area 12.5" ankle open 9.5" rise 11.5" inseam 33"